Reheating furnace



Feb. 9 1926'. 1,572,566

F. C. SIEMENS REHEATING FURHACE Filed Sept. 22. 1924 Patented Feb. 9, 1926.

UNITED STATE PATENT REHEATING FURNACE.

Application filed September 22,- 1924. 'Serial No. 739,180.

To all whom t nary concern.:

ln the accompanying` drawings various Be it known that I, FRIEDRICH CARL Snw constructional forms of the invention are incise, a citizen of the German Republic, and residing' at l5 Schiffbauerdamm, Berlin, NW. G, Germany, have invented certain new and useful improvements in Rehcatii'ig Furnaces, of which the following is a speer' ication.

ln order in the known reheating furnaces to pass the blocks, which are to be heated to welding heat, through the furnace, sliderails are provided in the furnace, consisting of simple tubes internally cooled with water, which usually rest on cast iron blocks or on supporting blocks of refractory material, As, owing to the high temperature in the furnaces, these supports are not capable of withstanding the high stresses due to the closely packed blocks, ithas been proposed to make the supports as well of water-cooled tubes, which are connected to the tubes forming the rails and are cooled together with the latter. Y

For making the manufacture of such rails as cheap as possible and for making them readily adjustable to the space available in each case, according to the present invention each slide-rail is composed of a plurality of relatively short inverted U-shaped lengths of tubing, the horizontal part of which constitutes the slide-way and the downwardly directed limbs the Asupporting members of the slide-way. Tubular slide and cooling-tube are in this case made in one piece, so that the manufacture of the lslide-rail is rendered extremely cheap. The length of the separate slide-rail pieces depends on their carrying capacity. They will in practice usually be so short that it will only be necessary to have one or at most' a few sizes for making slide-ways of any lengthfor furnaces of all kinds.

rEhe separate pieces are connected below the hearth of the furnace by bends, so that the cooling water may circulate.

The connecting bends may be replaced by bending the lengths of tubing in the form of loops and connecting them together where they meet. v

'lf the U-shaped lengths of tubing' of a slide-way are arranged obliquely to the longitudinal axis of the furnace, a continuous change in the points of contact of the blocks pushed along the slide-way with ,the sliderails is obtained, which is of great importance for the uniform softening of the blocks.

shown,

Fig. l being one constructional form in side elevation and Figs. 2 and 3 two plan views.

Fig. et shows a second constructional form in side elevation and l Fig. 5 in plan view.

The slide-way is composed of a plurality of pieces of tubing, which are bent in the form of an inverted U and which constitute both the slide-rail and the cooling tube. rlthe horizontal part a` of these pieces of tubing forms continuous slide-rail and the vertical downwardly directed limbs Z) constitute the supports for the rail. These limbs Z; pass through the hearth Z of the fur nace and their flanges o rest on the plate c supporting the hearth. They may of course be supported in any other suitable manner. Below the plate e the limbs Z) of the separate pieces of tubing are connected together by means of bends f, so that the cooling water, if required, may circulate through the whole series of tubular pieces constituting a slide-rail. Where the length of the slide-way is considerable, it is preferable to provide connections for the cooling water at various points or to havea number of circulating systems. I

Figs 2 and 3 `show the pieces of tubing of the slide-way arranged obliquely to the axis of the furnace, the arrangement being such that in Fig. 2 they are parallel to one another and in Fig. 3 intersect one another. ln each ease the material to be heated continuously changes its points of contact with the slide-rails as it is pushed along them, which ensures the uniform heating of the material. y

`The tubing may have any cross-section, but should preferably be thicker at the surface forming the slide-way.

ln the constructional form shown in Figs. 4 and 5 the tubes a, ZJ are bent in the form of loops, so that in this case the limbs Z) are connected together by the tubular member g, which rests on the plate c supporting the hearth of the furnace. `The horizontal part y of the tubular loops is fixed by means of clamps to the plate e or to separate rails, so as to provide a secure anchorage for the slide-rail. lln this case the slide-rail vconsists of a plurality of such tubular loops, which either all consist of one piece or are connected together by connecting sleeves fz', The convolutions of each separate loop lie close together, as shown in Fig.

lVhat l claim is l. A stationary unter-cooled sliderail for reheating furnaces, comprising in combination a plurality ot inverted U-shaped pieces ot tubing having a horizontal part constituting a slide-Way and downwardly directed .liinbs constituting supports 'for the slide- Wa-y, as set forth.

2. A stationary Water-cooled slide-rail for rcheating furnaces, comprising in combination a plurality of .inverted U-shaped pieces of tubing having a horizontal part constil tuting a slide-Way and lying obliquely with respect to the loi'igitudinal axis oit' the furnace and downwardly directed limbs constituting supports for the slide-way, as set forth.

8. A stationary Water-cooled slide-rail for reheating furnaces, comprising in combination a plurality o1 pieces of' tubing bent in. the torni of loops having a horizontal part constituting a slide-Way and vertical parts constituting supporting pillars for the slide-way, as set forth.

In testimony whereof l have signed my nume to this specification.`

FRIEDRICH CARL SIEMENS. 

